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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0f7981a0b8d111ee080c40907275252ffa7d7a36e5c7ca6c11821902ab0a9e' 
  AND token = 'pPpWgaG/b2W2AdvNQFUfl13X/77aXvqsxoMpXmN/D8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}